Physical Science Semester 1 Study Set

A 5-kg object is moving to the right with a constant velocity. The velocity value is 4 m/s. The net force encountered by the object is ____.

0 N

A length of 1000 m is equal to

1 km

Which mass would have the greatest acceleration if the same unbalanced force was applied to each?

10 kg

An object originally moving at a speed of 10. m/s accelerates uniformly for 5.0 seconds to a final speed of 60. meters per second. What is the acceleration of the object?

10. m/s^2

What is the approximate weight of a 10.0-kilogram object at the surface of Earth?

100 N

Which SI prefix kilo means

1000

How much work is done when a rock weighing 10 N is lifted a vertical distance of 8 meters?

2 J

Which of the following would be expected to experience the greatest force of friction?

20 kg block being towed across a rough

How many significant figures does the number 2.00 contain?

3

0.32 L = ______ cl

32

How many mL are in 0.35?

35

How many significant figures does the number 500700 contain?

4

The force of gravity of objects on the moon is approximately one-sixth of their value on Earth. Joe weighs 600 N on earth. Joe's mass on the moon will be approximately _____.

60 kg

The force of gravity of objects on the moon is approximately one-sixth of their value on Earth. Joe's weight on the moon is 100 N. Joe's mass on the Earth will be approximately _____.

60 kg

Which particle below has the greatest kinetic energy?

8 gram particle moving at 100 m/s

The attractive force that pulls objects toward the center of the earth is the

A force of gravity

Carlos says "I predict that students who sleep at least 8 hours a day have higher grades than those that get less than 8 hours of sleep." A scientist would classify this statement as

A hypothesis

An explanation of events or processes that is supported by many experiments is called:

A theory

A runner changed speed from 10 m/s to 20 m/s is an example of

Acceleration

As the mass of an object decreases, its inertia will

Decrease

A rightward moving object is coasting to a stop along a straight, level surface. The net force acting upon the object MUST be ____.

Directed leftward

A rightward-moving object would naturally and ultimately come to rest in the absence of forces. A rightward force is required to keep such an object moving rightward. Inertia is the general name given to that force.

False (Inertia is not a force)

"push or a pull" best describes the term

Force

For the following physical situation, identify the forces that are exerted upon the object. List all that apply A parachutist falls to the ground at a constant velocity.

Force due to gravity, air resistance

A dictionary weighing 30 Newtons is placed on a desk. According to Newton's 3rd Law, which is the force that the desk exerts on the dictionary?

Gram

Out on the playground, big Fred comes up to little Harry and gives him a shove. The reaction force to the force of Fred pushing Harry is _____.

Harry pushing Fred

The variable in an experiment that the experimenter choses to change is called the

Independent Variable

The acceleration of an object is ______ proportional to the net force and _______ proportional to its mass. Choose the appropriate units as listed in their respective order.

Inversely, directly

The forces acting upon an object are NOT BALANCED. Therefore, one can be absolutely certain that the object ____. List all that apply

Is changing its velocity, is accelerating

A car's velocity after each consecutive second of motion is 2 m/s, 4 m/s, 6 m/s, 8 m/s. This is evidence that the car ____.

Is covering more distance in each consecutive second

The forces acting upon an object are BALANCED. Therefore, one can be absolutely certain that the object ____. List all that apply

Is not accelerating

In a careless moment, Jane miscalculates her footing and falls from a low branch on a tree. As Jane falls from a tree, the reaction force to the force of the earth pulling Jane down is _____.

Jane pulling the earth up

When measuring he distance between Columbus to Cleveland, which would be the best unit of measurement to use?

Kilometer

The amount of matter in a substance is known as

Mass

The amount of matter or "stuff" in an object is referred to as the _____ of the object.

Mass

What form of energy is present in a ball rolling down a hill?

Mechanical

What is the standard SI unit of length?

Meter

For the following physical situation, identify the forces that are exerted upon the object. List all that apply A sledder slows down as it glides into the wind across some unpacked snow.

Normal Force, air resistance, force due to gravity, force of friction

In order to test a hypothesis, a scientist would

Perform an experiment

For the following physical situation, identify the forces that are exerted upon the object. List all that apply A sign is suspended by two cables and hangs at rest.

Tension, Force due to gravity

An astronaut on the Moon is holding a baseball and a balloon. The astronaut releases both objects at the same time.

The baseball and balloon fall at the same rate

Which statement correctly describes the interaction between the foot and the sidewalk as the person walks in the direction of the arrow?

The foot pushes backward on the sidewalk; the sidewalk pushes forward on the foot

Terminal velocity is

The maximum velocity attained by an object falling through the air

A rocket engine thrusts the rocket into space because

The rocket pushes on the gas and the gas pushes on the rocket

Which one of the following represent the velocity of an object?

The slope of a position-time graph

Which of the following would have the effect of decreasing the acceleration of an object?

Tripling the mass of the object, decreasing the net force experienced by the object

What quantity is being measured in a 100-milliliter graduated cylinder?

Volume

The position-time graph for an object with a velocity of zero would be a line with ____.

Zero slope

In an experiment designed to find out if music affects the growth of plants, it would be best to keep what as a controlled variable?

a. amount of light each plant received, amount of water each plant received, amount of fertilizer each plant received

Action and reaction forces always occur in equal and opposite pairs. They do not balance each other because the _____.

action and reaction forces act on different objects

In order to have work done upon an object, there must be a(n)____________________ to cause a(n) ________________.

force acting upon the object, displacement

Mass is expressed in units of _____ and weight is expressed in units of _____. (Choose the appropriate units as listed in their respective order.)

kilograms (kg), Newtons (N) T

What is the proper metric unit for expressing speed?

m/s

Friction converts

mechanical energy into thermal energy

A car that is moving at a constant velocity of 20 m/s, east for 10 seconds has an acceleration of ____ m/s/s.

o m/s/s

Base your answer to the following question on a box initially at rest on a floor. The box is initially at rest on a level floor and is being pulled by a force, as shown in the diagram below. Which statement is true?

static friction is greater than sliding friction

If the sum of all the forces acting on a car is zero, then the car must be

stopped or moving at a constant velocity